I’m trying to make a stem filling with a color and with circles for steps along the stem.
This is an example of what I’m currently aiming for: https://codepen.io/nicklassandell/pen/ztGac
This is currently what I have: https://codepen.io/TheOshika/full/xxRRVNb (the design is similar to the above code but I wrote the code from scratch)
I’m using a scrollspy script in order to trigger a filling animation in the circles. However I’m not satisfied with it because the offset for the trigger is too difficult to set for a responsive design. I’m now thinking about removing the javascript part and instead having a stem filling the circles with the scrolling, but no animation.
This is what I’m looking for, except I don’t know how to make the background color in the stem fill the circles:
.header {
position: relative;
height: 800px;
background: blueviolet;
z-index: 3;
}
html,
body {
margin: 0;
padding: 0;
}
body {
background: #4c63b6;
}
.container {
margin: 0px auto;
position: relative;
}
/* stem */
.filling-stem {
position: sticky;
z-index: 1;
float: left;
top: 0;
left: 50%;
transform: translate(-50%, 0);
height: 50vh;
width: 5px;
background-color: #bed0f7;
}
.stem-background {
position: absolute;
z-index: 0;
left: 50%;
transform: translate(-50%, 0);
height: 100%;
width: 5px;
background-color: #1f2933;
}
.stem-nav {
position: absolute;
z-index: 2;
left: 50%;
transform: translate(-50%, 0);
height: 100%;
}
#my-awesome-nav {
display: flex;
height: 100%;
justify-content: space-around;
flex-direction: column;
list-style: none;
margin-left: 0;
padding-left: 0;
}
#my-awesome-nav li a {
border: solid 3px black;
border-radius: 50%;
display: inline-block;
background-color: #1f2933;
}
#my-awesome-nav li a .color-change {
height: 40px;
width: 40px;
background-color: #1f2933;
border-radius: 50%;
}
/* timeline */
.timeline-container {
position: relative;
}
.step-container {
margin: 0 25% 0 25%;
display: flex;
align-items: center;
height: 1500px;
}
/* footer */
footer {
display: flex;
justify-content: center;
align-items: center;
height: 1000px;
width: 100%;
background-color: black;
color: white;
}
<div class="container">
<div class="container-inner">
<div class="filling-stem"></div>
<div class="header"></div>
<div class="timeline-container">
<div class="timeline-container-inner">
<div class="stem-background"></div>
<div class="stem-nav">
<ul id="my-awesome-nav">
<li data-index="0"><a href="#step-one">
<div class="color-change one"></div>
</a></li>
<li data-index="1"><a href="#step-two">
<div class="color-change two"></div>
</a></li>
<li data-index="2"><a href="#step-three">
<div class="color-change three"></div>
</a></li>
<li data-index="3"><a href="#step-four">
<div class="color-change four"></div>
</a></li>
<li data-index="4"><a href="#step-five">
<div class="color-change five"></div>
</a></li>
</ul>
</div>
<div class="step-container">
<div class="step-container-inner">
</div>
</div>
</div>
</div>
</div>
</div>
<footer>
<p>End of the page</p>
</footer>
It should be possible to get the required ‘filling’ effect using just CSS.
We add a pseudo before and a pseudo after element to each of the li elements. These have a radial-gradient background which has a transparent ‘bite’ out at the position of the circles containing the a (anchor) element. Behind the whole thing we put a fixed element which has the ‘fill’ color in the top half and the darker (non-filled) color in the bottom half. This is done by giving it a background image which is a linear gradient.
The inner divs (inside the anchor elements) are not now needed.
Here is a snippet to show the idea. CSS variables have been introduced to make it easier to change dimensions if required. (Note: there is redundant CSS in here which could do with tidying up.)
Footnote: on retina screens I’ve occasionally seen a faint line between the pseudo elements – I think it’s where the positioning calculations come at part of a CSS pixel (which on a high res screen may mean a screen pixel is ‘left behind’). It’s probably necessary to make the pseudo elements 1 CSS pixel higher to overlap the next one to give a continuous effect to the background.